Method for preparing porous ceramic filter membrane by low-temperature sintering

A technology of porous ceramics and low-temperature sintering, applied in the field of ceramic materials, can solve the problems of contradicting low consumption, green, environmental protection and sustainable development, increasing the production cost of ceramic filter membranes, and being difficult to realize industrialized production, etc., and achieve a complete membrane thickness. , The effect of reducing energy consumption and easy availability of equipment

Inactive Publication Date: 2015-05-06
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both CN101182233A and CN101954246A disclose a method for preparing a film layer by tape casting method, which can only be used for flat support materials, and the area is not easy to be too large; the vapor deposition method is complicated in process and high in cost, and it is difficult to realize industrial production; The sol-gel method is mostly used in the preparation of ultrafiltration membranes; CN103193513A and CN102659447A disclose a method for obtaining a film layer by air spraying, which requires strict control of process parameters such as inlet pressure, nozzle opening angle and gun speed, It is not easy to prepare a film layer in a small space, and it is easy to introduce air bubbles during the spraying process, which reduces the filtration accuracy of the film layer; the anodic oxidation method is limited to metal oxides
The sintering temperature of the ceramic membrane layer in many disclosed methods for preparing porous ceramic membrane layer is above 1200°C, which greatly increases the production cost of the ceramic filter membrane, reduces the prospect of its large-scale industrial production and popularization and application, and the energy Large consumption is contrary to the concept of low consumption, green, environmental protection and sustainable development

Method used

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  • Method for preparing porous ceramic filter membrane by low-temperature sintering
  • Method for preparing porous ceramic filter membrane by low-temperature sintering
  • Method for preparing porous ceramic filter membrane by low-temperature sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Excellent sintering aid: Put the glass phase, silica powder, feldspar and clay in a nylon tank at a mass ratio of 50:30:5:15 to form a mixture, and then add 40% of the total volume of the mixture to it Anhydrous ethanol as a solvent, mixed on a ball mill for 12 hours with alumina ceramic balls, dried, and passed through a 500-mesh sieve to obtain a sintering aid; wherein, the total volume of the added solvent anhydrous ethanol and the mixture is the same as that of the alumina The volume ratio of the ceramic grinding ball is 1:1.5; the filling ratio of the mixture in the nylon tank is 30%;

[0039] 2) In terms of parts by mass, add 43.9 parts of industrial grade black silicon carbide particles W40 and 6 parts of sintering aid to 50 parts of deionized water in batches by mechanical stirring; after 5 minutes, accurately weigh 1 part of carboxyl Add sodium methylcellulose in batches, then continue to stir for 20 minutes until sodium carboxymethylcellulose dissolves comp...

Embodiment 2

[0045] 1) Excellent sintering aid: Put the glass phase, silica powder, feldspar and clay in a nylon tank at a mass ratio of 40:20:10:30 to form a mixture, and then add 20% of the total volume of the mixture to it Solvent absolute ethanol, use silicon carbide ceramic balls to mix on a ball mill for 24 hours and dry, pass through a 500 mesh sieve to obtain a sintering aid; the added solvent absolute ethanol and the total volume of the mixture are the same The volume ratio of the ball is 1:1; the filling ratio of the mixture in the nylon tank is 40%;

[0046] 2) In terms of parts by mass, add 42 parts of industrial grade black silicon carbide particles W40 and 6 parts of sintering aid to 50 parts of deionized water in batches by mechanical stirring; after 5 minutes, accurately weigh 1.5 parts of carboxyl Sodium methylcellulose was added therein in batches, and then continued to stir for 20 minutes until the sodium carboxymethylcellulose was completely dissolved; then 0.5 parts of...

Embodiment 3

[0053] 1) Excellent sintering aid: Put glass phase, silica, feldspar and clay in a nylon tank at a mass ratio of 43:25:7:25 to form a mixture, and then add 40% of the total volume of the mixture to it The solvent absolute ethanol is mixed with alumina ceramic balls on a ball mill for 24 hours, dried, and passed through a 500-mesh sieve to obtain a sintering aid; the added solvent absolute ethanol and the total volume of the mixture are equal to The volume ratio of the ball is 1:1; the filling ratio of the mixture in the nylon tank is 50%;

[0054] 2) In terms of parts by mass, add 52.3 parts of industrial grade black silicon carbide particles W40 and 5 parts of sintering aid to 40 parts of deionized water in batches by mechanical stirring; after 5 minutes, accurately weigh 1 part of carboxyl Sodium methylcellulose and 1 part of polyvinyl alcohol were added in batches, and then continued to stir for 40 minutes until sodium carboxymethylcellulose and polyvinyl alcohol were compl...

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Abstract

The invention discloses a method for preparing a porous ceramic filter membrane by low-temperature sintering. The method comprises the following steps: mixing and stirring ceramic aggregate particles, a sintering aid, deionized water, a dispersant and a defoamer, then carrying out vacuum pressure maintaining to remove a gas in the obtained filter membrane layer slurry; soaking a support body material in the filter membrane layer slurry, then obtaining a membrane layer on the support material by a pulling method, and then sintering at 700-1070 DEG C to obtain the porous ceramic filter membrane. According to the method, the porous ceramic membrane product which is high in strength, resistant to wear and corrosion, long in life and low in cost is obtained by optimally proportioning the sintering aid, the dispersant and the defoamer, preparing the ceramic membrane layer slurry system with high stability and proper viscosity, regulating the pulling method of the ceramic support body with a high porosity and a large hole diameter in the prefabricated membrane layer slurry system, thereby obtaining a uniform and asymmetrical porous ceramic membrane blank on the whole surface of a specified position of the support body material, and finally drying stage by stage and rapidly sintering at a low temperature of 1100 DEG C so as to obtain a porous ceramic filter membrane product with high intensity, abrasion resistance, corrosion resistance, long service life and low cost.

Description

technical field [0001] The invention belongs to the field of ceramic materials, and in particular relates to a method for preparing a porous ceramic filter membrane by low-temperature sintering. Background technique [0002] Compared with metal membranes and organic membranes, ceramic membranes have the advantages of high temperature resistance, corrosion resistance, high strength, easy regeneration, long service life, high separation precision, and high efficiency. They are used in many fields such as food, beverage, biomedicine, chemical industry, and electric power. It has broad application prospects, for example, it is an ideal filter material in gas-solid separation systems under high temperature and high pressure, including clean coal power generation systems such as integrated coal gasification combined cycle (IGCC) and pressurized fluidized bed combustion combined cycle (PFBC) . [0003] At present, the preparation methods of ceramic filter membranes mainly include ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00C04B41/87
Inventor 李红伟梁俊平贾念念李雯王伟桑可正
Owner CHANGAN UNIV
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